20507366609 has 2 divisors, whose sum is σ = 20507366610. Its totient is φ = 20507366608.

The previous prime is 20507366599. The next prime is 20507366669. The reversal of 20507366609 is 90666370502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16725731584 + 3781635025 = 129328^2 + 61495^2 .

It is a cyclic number.

It is not a de Polignac number, because 20507366609 - 2⁸ = 20507366353 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20507366609.

It is not a weakly prime, because it can be changed into another prime (20507366669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10253683304 + 10253683305.

It is an arithmetic number, because the mean of its divisors is an integer number (10253683305).

Almost surely, 2^20507366609 is an apocalyptic number.

It is an amenable number.

20507366609 is a deficient number, since it is larger than the sum of its proper divisors (1).

20507366609 is an equidigital number, since it uses as much as digits as its factorization.

20507366609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 408240, while the sum is 44.

The spelling of 20507366609 in words is "twenty billion, five hundred seven million, three hundred sixty-six thousand, six hundred nine".